Despite some showers to the west on Wednesday, Palm Beach International Airport hasn’t had any measurable rainfall since last Friday.

The three-day rainfall forecast through Sunday by NOAA’s Weather Prediction Center shows more than 2 inches of rain falling in South Florida. Weather Underground is calling for about an inch in Palm Beach.

Projected rainfall totals through Sunday. (Credit: NOAA/ WPC)

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HAPPY ASTEROID DAY: June 30 marks the 108th anniversary of the space rock that smashed into Earth near the Podkamennaya Tunguska River in Siberia, the biggest asteroid impact in recent history.

Launched last year, Asteroid Day is an effort by researchers to keep the focus on potentially hazardous asteroids so we can prepare for the next big one.

Asteroid approaches through Sept. 10. (Credit: NASA)

The Slooh Community Observatory will host a 4-hour live webcast on Space.com at 7 p.m. EDT today, during which experts will talk about asteroid detection, deflection and mining. Scientists will take questions on Twitter and slooh.com.

Asteroid Day also has its own blog with a list of links to other events throughout the day that can be live streamed.

There’s no imminent threat — the closest detected space rock will come within 6 lunar distances to Earth on Aug. 3. That’s six times the distance between the Earth and the moon, or about 1.2 million miles.

Asteroid threats pack a lot of drama since you can see them coming, and Hollywood has made a lot of mileage on these threats with a series of successful movies.

But a much bigger threat is the “super volcano” under Yellowstone National Park, the University of Alabama reports in a news release posted on the school’s website today.

“If the Yellowstone super volcano erupts, it will take out anywhere from 20-30 percent of the continent,” says Robert Mohr, an instructor in the University of Alabama at Birmingham’s Department of Physics. “And the effects will be felt basically everywhere in the United States and in places beyond, potentially for years.”

The last time it erupted 600,000 years ago, it spewed more than 1,000 cubic meters and lava and ash into the atmosphere — enough to bury a large city and change the climate quickly.

“A Yellowstone eruption would alter life as we know it for a long time,” Mohr says. “Sunlight would be blocked for long periods of time, which would affect crop growth and food supply. Preparing for something like that, which is a lot closer to a likelihood than an asteroid’s hitting Earth, would seem to me to be more prudent.”